147 years old now in 2025 - what year born?

Today, 19 April 2025 if a person is 147 years old now, what year was he born? See below:

If 147 years old, year of birth is:
1877 or 1878*

*It depends on whether he was born before or after 1 January 1878.

If now 147 years and his year of birth 1877 if he was born after 19 April 1877 until 31 december 1877 inclusively, and his year of birth is 1878 if he was born from 1 January 1878 to 19 April 1878.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 17 years, year of birth 2007 or 2008
If now 28 years, year of birth 1996 or 1997
If now 73 years, year of birth 1951 or 1952

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